Nitrogen-doped carbon nanosheets and nanoflowers with holey mesopores for efficient oxygen reduction catalysis

Tian, Hao; Wang, Nan; Xu, Fugui; Zhang, Pengfei; Hou, Dan; Mai, Yiyong; Feng, Xinliang

doi:10.1039/c8ta02319k

Cited by 69 publications

(60 citation statements)

References 50 publications

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“…[ c] The organic capacitances were calculated in at wo-electrode CR2032 coin-cell system under 1 m TEABF 4 /MeCN. formance data are good when compared with those from other previous studies of EDLCs upercapacitors incorporating mesoporousc arbon [33][34][35][36][37][38][39][40] and nonporous carbons ( Ta ble S2 and References S1-S12 in the Supporting Information).…”

Section: Resultssupporting

confidence: 53%

Mesoporous Carbons Templated by PEO‐PCL Block Copolymers as Electrode Materials for Supercapacitors

Ahmed

et al. 2019

Chemistry A European J

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In this study,s amples of activated mesoporous carbon are fabricated with pore structures with cylinder and gyroid nanostructures through the templatinge ffect of amphiphilic poly(ethylene oxide-block-caprolactone)( PEO-PCL) and by using specific resol/PEO-PCL weightr atios (e.g., 60:40 for cylinders;5 5:45 for gyroids). After carbonization and KOH activation, the activated mesoporous carbons were tested as electrode materials for electric double-layerc apacitor (EDLC)s upercapacitors. The electrochemical properties were examined by using three-electrode (6 m KOH (aq) as electrolyte) and CR2032c oin-cell (1 m tetraethylammonium tetra-fluoroborate (TEABF 4 )/CN as the electrolyte) systems. The gyroid carbon samples provided specific capacitances higher than those of the cylinder carbon samples in both aqueous and organic systems:1 55 Fg À1 compared with 135 Fg À1 in 6 m KOH (aq) ,a nd 105.6 compared with 96 Fg À1 in 1 m TEABF 4 / MeCN, after 100 charge/discharge cycles. It is suspected that the bi-continuous mesochannels of the gyroid-type activated mesoporousc arbonsp rovided ar elatively higher effective adsorption surfacea rea;i no ther words, the greater surface area for energy storageo riginated from am oderate pore size and an interconnected pore structure.[a] Dr.

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Section: Resultssupporting

confidence: 53%

Mesoporous Carbons Templated by PEO‐PCL Block Copolymers as Electrode Materials for Supercapacitors

Ahmed

et al. 2019

Chemistry A European J

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“…On the other hand, mesoporous structure in electrode materials can largely increase specific surface area, reserve the electrolyte, and combine the ionic–electronic conductive pathways . Of particular importance is that the well‐defined mesopores can always bring unprecedented and controllable properties . Coating well‐defined mesoporous electrochemically active materials on free‐standing nanosheets, such as graphene, will thereby produce desirable 2D sandwich‐structured hybrid nanomaterials for high‐performance supercapacitors .…”

Section: Figurementioning

confidence: 99%

General Interfacial Self‐Assembly Engineering for Patterning Two‐Dimensional Polymers with Cylindrical Mesopores on Graphene

et al. 2019

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Free-standing 2D porous nanomaterials have attracted considerable interest as ideal candidates of 2D film electrodes for planar energy storage devices.N evertheless,t he construction of well-defined mesopore arrays parallel to the lateral surface,w hichf acilitate fast in-plane ionic diffusion, is achallenge.Now,auniversal interface self-assembly strategy is used for patterning 2D porous polymers,f or example, polypyrrole,p olyaniline,a nd polydopamine,w ith cylindrical mesopores on graphene nanosheets.T he resultant 2D sandwich-structured nanohybrids are employed as the interdigital microelectrodes for the assembly of planar micro-supercapacitors (MSCs), whichd eliver outstanding volumetric capacitance of 102 Fcm À3 and energy density of 2.3 mWh cm À3 , outperforming most reported MSCs.T he MSCs display remarkable flexibility and superior integration for boosting output voltage and capacitance.

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“…This is because of the high accessibility of the micro-and mesopores or catalytically active sites for the electrolyte provided by the unique morphology with a hierarchical pore structure and the facile electron transport through the 3D interconnected nanopetals, which leads to exceptional electrochemical performance. [15][16][17][18][19][20][21][22][23][24] Flowerlike and hierarchical carbons in general have been prepared by using various low-dimensional building blocks (e.g., polymer sheets, carbon nanotubes, graphene oxide) [3,4,15,20] and multiple templates with different length scales (e.g., block copolymers, silica materials, foams). [14,16,18,19,25,26] However, the approaches usually rely on time-consuming and laborious multi-step procedures, including preparation of building blocks/sacrificial templates and their bottom-up assembly under specific conditions, infiltration/ polymerization of carbon source, carbonization, and template removal.…”

Section: Doi: 101002/smll201901986mentioning

confidence: 99%

Micro‐Blooming: Hierarchically Porous Nitrogen‐Doped Carbon Flowers Derived from Metal‐Organic Mesocrystals

Hwang

Walczak

Oschatz

et al. 2019

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Synthesis of 3D flower‐like zinc‐nitrilotriacetic acid (ZnNTA) mesocrystals and their conformal transformation to hierarchically porous N‐doped carbon superstructures is reported. During the solvothermal reaction, 2D nanosheet primary building blocks undergo oriented attachment and mesoscale assembly forming stacked layers. The secondary nucleation and growth preferentially occurs at the edges and defects of the layers, leading to formation of 3D flower‐like mesocrystals comprised of interconnected 2D micropetals. By simply varying the pyrolysis temperature (550–1000 °C) and the removal method of in the situ‐generated Zn species, nonporous parent mesocrystals are transformed to hierarchically porous carbon flowers with controllable surface area (970–1605 m2 g−1), nitrogen content (3.4–14.1 at%), pore volume (0.95–2.19 cm3 g−1), as well as pore diameter and structures. The carbon flowers prepared at 550 °C show high CO2/N2 selectivity due to the high nitrogen content and the large fraction of (ultra)micropores, which can greatly increase the CO2 affinity. The results show that the physicochemical properties of carbons are highly dependent on the thermal transformation and associated pore formation process, rather than directly inherited from parent precursors. The present strategy demonstrates metal‐organic mesocrystals as a facile and versatile means toward 3D hierarchical carbon superstructures that are attractive for a number of potential applications.

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Nitrogen-doped carbon nanosheets and nanoflowers with holey mesopores for efficient oxygen reduction catalysis

Abstract: Efficient structure optimization is one of the key factors for improving the oxygen reduction reaction (ORR) catalytic performance of carbon materials.

Cited by 69 publications

References 50 publications

Mesoporous Carbons Templated by PEO‐PCL Block Copolymers as Electrode Materials for Supercapacitors

Mesoporous Carbons Templated by PEO‐PCL Block Copolymers as Electrode Materials for Supercapacitors

General Interfacial Self‐Assembly Engineering for Patterning Two‐Dimensional Polymers with Cylindrical Mesopores on Graphene

Micro‐Blooming: Hierarchically Porous Nitrogen‐Doped Carbon Flowers Derived from Metal‐Organic Mesocrystals

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